title: 4-[4-(Hept-yloxy)benzo-yloxy]phenyl 2-oxo-7-tri-fluoro-methyl-2H-chromene-3-carboxyl-ate.
abstract: The title compound, C31H27F3O7, is a liquid crystal and exhibits enanti-otropic SmA and nematic phase transitions. In the crystal, the the 2H-chromene ring system makes dihedral angles of 54.46 (17) and 7.79 (16)°, respectively, with the central benzene ring and 4-(hept-yloxy)benzene ring. The three F atoms of the -CF3 group are disordered over two sets of sites, with an occupancy ratio of 0.62 (3):0.38 (3). The crystal structre features two pairs of C-H⋯O hydrogen bonds, which form inversion dimers and generate R 2 (2)(10) and R 2 (2)(30) ring patterns. C-H⋯O inter-actions along [100] and C-H⋯π inter-actions futher consolidate the packing, leading to a three-dimensional network.
authors.affiliation: Department of Physics, Yuvaraja's College (Constituent College), University of Mysore Mysore, Karnataka 570 005, India.
authors.forename: H C
authors.initials: HC
authors.lastname: Devarajegowda
authors.forename: B S
authors.initials: BS
authors.lastname: Palakshamurthy
authors.forename: H N
authors.initials: HN
authors.lastname: Harishkumar
authors.forename: P A
authors.initials: PA
authors.lastname: Suchetan
authors.forename: S
authors.initials: S
authors.lastname: Sreenivasa